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MPLS rings switching issue + un-sync alarms demystified! Highlighted

Created: Apr 30, 2021 19:39:39Latest reply: Jun 15, 2021 07:59:07 871 32 10 0 0

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MPLS rings switching issue + un-sync alarms demystified!

Hello Friends,

Today, I would like to share a long pending issue, that we were getting un-necessary escalations due MPLS switching status issue between NE and NCE.

Issue

Some of MPLS rings were showing switching result as SWITCHED while Alarm status showing NORMAL and there were no alarms found on NE as well.

Product:

- Huawei OptiX PTN 3900 / 3900-8
- NMS: iMaster NCE-T

MPLS switching 1

Ring Switiching & Alarm at NCE

Analysis

After the link between transmissions nodes (here discussing PTN) recover (after optical fiber restored), the ring protection status on the NE side is restored to the normal state (after the WTR [Wait To Restore] time) and this event is reported to the NCE only once.

If the event is discarded due to some reason such as DCN issue on the upstream network, the event cannot reach the NMS. If the NCE does not receive an event message, it does not notify NCE to update the ring protection status.

Solution

When the ring protection status is refreshed on the NE side, the NE sends the ring protection status event of the current NE to the NMS for three more times after the first state switching event is reported. This prevents the NMS from being notified of the event after the first event message is discarded.

The NMS synchronizes and adapts the events of the ring protection status to update the end-to-end (E2E) ring protection status

This is recommended to upgrade Patch for corresponding PTN 3900/3900/8 is V100R007C; the mainstream version of PTN 7900E-32 is V100R012C00, instead of manual refreshing every time when issue occurs.

These patch will avoid additional effort of manual syncing status

PTN3900/960 V100R007C10SPH127 / V100R007C00SPH120
PTN7900E-32 V100R012C00SPH308

Also NCE iMaster patch version should be NCE V100R019C00CP6025 to improve and optimize the alarm caching mechanism.

MPLS Switching 2

Refresh Switching at NCE

It is recommended that you can refresh the ring switch status manually in case of unexpected problems in extreme condition

You are welcome to leave a message and exchange in the comment area. Thank you!

NCE PTN PTN3900 Ring Switching

The post is synchronized to: Community Blog

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Irina Admin Created Jun 15, 2021 07:59:07

Hello, @BAZ
Because your article is very qualitative and valuable, we've decided to feature it on our Blog Collection: https://forum.huawei.com/enterprise/en/forum.php?mod=collection&action=view&ctid=431&orderby=views&order=desc

Congrats!

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^2#

BAZ

MVE Author Created Apr 30, 2021 19:45:58

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andersoncf1 Created Apr 30, 2021 19:50:14 (0) (0)
Congrats dear friend

zaheernew Created May 1, 2021 10:51:42 (0) (0)
good job

umaryaqub Created May 1, 2021 15:40:40 (0) (0)
Good work

csk99 Created May 5, 2021 09:11:40 (0) (0)
great

(1) (0)

^3#

Unicef

MVE Created May 1, 2021 02:58:07

WELL DONE

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BAZ Created May 1, 2021 09:15:58 (0) (0)
Thanks for appreciation

(0) (0)

^4#

Laiheang

Created May 1, 2021 03:07:04

nice

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(0) (0)

^5#

S_Noch

Created May 1, 2021 03:11:49

Not bad

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^6#

Saqib123

Created May 1, 2021 09:34:20

Good

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BAZ Created May 1, 2021 09:56:22 (0) (0)
:)

(0) (0)

^7#

zaheernew

MVE Author Created May 1, 2021 10:51:52

great

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^8#

MahMush

Author Created May 1, 2021 11:08:42

Wow nicely explained whole scenario and solution, well done

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BAZ Created May 1, 2021 13:46:40 (0) (0)
Yes this was a long pending issue solved

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^9#

csk99

Created May 1, 2021 14:37:59

Good Job

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umaryaqub

MVE Created May 1, 2021 15:41:20

Thanks for sharing... especially covering the whole scenario.

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BAZ Created May 1, 2021 19:54:40 (1) (0)
Thanks for kind words

umaryaqub Reply BAZ Created May 2, 2021 15:40:13 (1) (0)

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